"quantity having magnitude and direction," 1704, from Latin vector "one who carries or conveys, carrier," from past participle stem of vehere "carry, convey" (see vehicle).
vector vec·tor (věk'tər)
n.
An organism, such as a mosquito or tick, that carries disease-causing microorganisms from one host to another.
A bacteriophage, a plasmid, or another agent that transfers genetic material from one location to another.
A quantity, such as velocity, completely specified by a magnitude and a direction.
vector (věk'tər)
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In physics and mathematics, any quantity with both a magnitude and a direction. For example, velocity is a vector because it describes both how fast something is moving and in what direction it is moving. Because velocity is a vector, other quantities in which velocity is a factor, such as acceleration and momentum, are vectors also.